/* ============================================
   静致通久（北京）文化传媒有限公司 - 官网样式
   ============================================ */

:root{
  --ink:        #0e0e0e;
  --ink-soft:   #1c1c1c;
  --paper:      #faf9f6;
  --paper-2:    #f2f0eb;
  --red:        #b0392c;
  --red-deep:   #8d2b21;
  --gray:       #6f6f6f;
  --gray-light: #9a9a9a;
  --line:       rgba(0,0,0,.10);
  --line-dark:  rgba(255,255,255,.14);

  --sans: "PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans CN","Noto Sans CJK SC",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  --serif: "Songti SC","STSong","Source Han Serif SC","Noto Serif CJK SC","SimSun",Georgia,serif;

  --nav-h: 78px;
  --ease: cubic-bezier(.22,.61,.36,1);
}

*,*::before,*::after{ box-sizing:border-box; }

html{ scroll-behavior:smooth; -webkit-text-size-adjust:100%; }

body{
  margin:0;
  font-family:var(--sans);
  background:var(--paper);
  color:var(--ink);
  font-size:16px;
  line-height:1.8;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

img{ max-width:100%; display:block; }
a{ color:inherit; text-decoration:none; }
h1,h2,h3,h4,p{ margin:0; }
ul{ margin:0; padding:0; list-style:none; }
button{ font-family:inherit; cursor:pointer; border:0; background:none; }

.wrap{
  width:100%;
  max-width:1240px;
  margin:0 auto;
  padding:0 40px;
}

/* ---------- 动画 ---------- */
[data-anim]{
  opacity:0;
  transform:translateY(34px);
  transition:opacity .9s var(--ease), transform .9s var(--ease);
}
[data-anim].is-in{ opacity:1; transform:none; }
[data-delay="1"]{ transition-delay:.10s; }
[data-delay="2"]{ transition-delay:.20s; }
[data-delay="3"]{ transition-delay:.30s; }

@media (prefers-reduced-motion: reduce){
  [data-anim]{ opacity:1; transform:none; transition:none; }
  html{ scroll-behavior:auto; }
}

/* ============================================
   导航
   ============================================ */
.nav{
  position:fixed; top:0; left:0; right:0;
  z-index:100;
  height:var(--nav-h);
  background:transparent;
  transition:background .45s var(--ease), box-shadow .45s var(--ease), height .35s var(--ease);
}
.nav__inner{
  max-width:1240px; height:100%;
  margin:0 auto; padding:0 40px;
  display:flex; align-items:center; justify-content:space-between; gap:30px;
}

/* 深底状态下的导航（首屏） */
.nav--over .nav__logo strong,
.nav--over .nav__link{ color:#fff; }
.nav--over .nav__logo em{ color:rgba(255,255,255,.55); }
.nav--over .logo__mark{ background:var(--red); color:#fff; }
.nav--over .nav__cta{
  color:#fff; border-color:rgba(255,255,255,.4);
}
.nav--over .nav__cta:hover{ background:#fff; color:var(--ink); border-color:#fff; }
.nav--over .nav__toggle span{ background:#fff; }

/* 滚动后 */
.nav.is-solid{
  background:rgba(250,249,246,.94);
  backdrop-filter:saturate(180%) blur(14px);
  -webkit-backdrop-filter:saturate(180%) blur(14px);
  box-shadow:0 1px 0 var(--line);
  height:68px;
}

.nav__logo{ display:flex; align-items:center; gap:12px; }
.logo__mark{
  width:38px; height:38px; flex:0 0 38px;
  display:grid; place-items:center;
  background:var(--ink); color:#fff;
  font-family:var(--serif);
  font-size:21px;
  border-radius:3px;
  transition:background .4s var(--ease), color .4s var(--ease);
}
.logo__text{ display:flex; flex-direction:column; line-height:1.25; }
.logo__text strong{
  font-family:var(--serif);
  font-size:19px; font-weight:700; letter-spacing:.14em;
  color:var(--ink);
  transition:color .4s var(--ease);
}
.logo__text em{
  font-style:normal;
  font-size:9px; letter-spacing:.24em;
  color:var(--gray-light);
  transition:color .4s var(--ease);
}

.nav__menu{ display:flex; align-items:center; gap:38px; }
.nav__link{
  position:relative;
  font-size:15px; letter-spacing:.06em;
  color:var(--ink);
  padding:6px 0;
  transition:color .3s var(--ease), opacity .3s var(--ease);
}
.nav__link::after{
  content:"";
  position:absolute; left:0; bottom:0;
  width:0; height:1px; background:var(--red);
  transition:width .35s var(--ease);
}
.nav__link:hover::after,
.nav__link.is-active::after{ width:100%; }
.nav__link.is-active{ color:var(--red); }
.nav--over .nav__link.is-active{ color:#fff; }
.nav--over .nav__link::after{ background:#fff; }

.nav__right{ display:flex; align-items:center; gap:16px; }
.nav__cta{
  border:1px solid var(--line);
  padding:9px 22px;
  font-size:14px; letter-spacing:.08em;
  color:var(--ink);
  border-radius:2px;
  transition:background .35s var(--ease), color .35s var(--ease), border-color .35s var(--ease);
}
.nav__cta:hover{ background:var(--ink); color:#fff; border-color:var(--ink); }
.nav--over .nav__cta:hover{ background:#fff; color:var(--ink); }

.nav__toggle{ display:none; width:30px; height:22px; position:relative; }
.nav__toggle span{
  position:absolute; left:0; width:100%; height:1.5px;
  background:var(--ink);
  transition:transform .35s var(--ease), opacity .25s var(--ease), background .4s var(--ease);
}
.nav__toggle span:nth-child(1){ top:2px; }
.nav__toggle span:nth-child(2){ top:10px; }
.nav__toggle span:nth-child(3){ top:18px; }
.nav.is-open .nav__toggle span:nth-child(1){ transform:translateY(8px) rotate(45deg); }
.nav.is-open .nav__toggle span:nth-child(2){ opacity:0; }
.nav.is-open .nav__toggle span:nth-child(3){ transform:translateY(-8px) rotate(-45deg); }

/* ============================================
   首屏
   ============================================ */
.hero{
  position:relative;
  min-height:100vh;
  background-color:var(--ink);
  background-image:url('../img/hero-bg.jpg');
  background-size:cover;
  background-position:center;
  background-repeat:no-repeat;
  color:#fff;
  display:flex; align-items:center;
  overflow:hidden;
  padding:calc(var(--nav-h) + 40px) 0 120px;
}
.hero::before{
  content:"";
  position:absolute; inset:0;
  background:
    linear-gradient(110deg,
      rgba(0,0,0,.80) 0%,
      rgba(0,0,0,.64) 42%,
      rgba(0,0,0,.50) 74%,
      rgba(0,0,0,.38) 100%),
    linear-gradient(0deg,
      rgba(0,0,0,.42) 0%,
      rgba(0,0,0,0)   55%);
  z-index:1;
}
.hero__bg{ position:absolute; inset:0; overflow:hidden; z-index:2; }
.hero__grain{
  position:absolute; inset:0;
  background-image:
    radial-gradient(circle at 20% 30%, rgba(255,255,255,.045) 0, transparent 45%),
    radial-gradient(circle at 78% 68%, rgba(176,57,44,.16) 0, transparent 50%);
}
.hero__circle{
  position:absolute; border-radius:50%;
  border:1px solid rgba(255,255,255,.07);
}
.hero__circle--1{
  width:720px; height:720px; right:-180px; top:-140px;
  animation:float 22s ease-in-out infinite;
}
.hero__circle--2{
  width:460px; height:460px; left:-160px; bottom:-160px;
  border-color:rgba(176,57,44,.14);
  animation:float 17s ease-in-out infinite reverse;
}
@keyframes float{
  0%,100%{ transform:translate(0,0); }
  50%    { transform:translate(-26px,22px); }
}

.hero__content{
  position:relative; z-index:3;
  width:100%; max-width:1240px;
  margin:0 auto; padding:0 40px;
  display:grid;
  grid-template-columns:minmax(0,1.12fr) minmax(0,.88fr);
  column-gap:60px;
  align-items:end;
}
.hero__lead{ min-width:0; }
.hero__aside{ min-width:0; padding-bottom:10px; }

.hero__eyebrow{
  display:flex; align-items:center; gap:16px;
  margin-bottom:26px;
}
.hero__eyebrow::before{
  content:"";
  flex:0 0 38px; height:1px;
  background:var(--red);
}
.hero__eyebrow-text{
  font-family:var(--serif);
  font-size:clamp(16px,1.8vw,22px);
  font-weight:600;
  letter-spacing:.12em;
  line-height:1.5;
  color:rgba(255,255,255,.92);
  text-shadow:0 1px 16px rgba(0,0,0,.55);
}
.hero__title{
  font-family:var(--serif);
  font-size:clamp(34px, 5.6vw, 72px);
  font-weight:700;
  line-height:1.22;
  letter-spacing:.05em;
  margin-bottom:0;
}
.hero__title .line{ display:block; }
.hero__title .line:last-child{
  color:transparent;
  -webkit-text-stroke:1px rgba(255,255,255,.62);
}
.hero__desc{
  font-size:clamp(15px,1.35vw,17px);
  line-height:2.05;
  color:rgba(255,255,255,.82);
  margin-bottom:36px;
  text-shadow:0 1px 16px rgba(0,0,0,.6);
}
.hero__meta{
  display:flex; align-items:center; flex-wrap:wrap; gap:16px;
  font-size:13px; letter-spacing:.16em;
  color:rgba(255,255,255,.62);
  text-shadow:0 1px 14px rgba(0,0,0,.55);
}
.hero__meta i{
  width:22px; height:1px; background:rgba(255,255,255,.22);
  display:inline-block;
}

.hero__scroll{
  position:absolute; left:50%; bottom:42px;
  transform:translateX(-50%);
  z-index:2;
  display:flex; flex-direction:column; align-items:center; gap:12px;
  color:rgba(255,255,255,.45);
  font-size:10px; letter-spacing:.35em;
}
.mouse{
  width:22px; height:34px;
  border:1px solid rgba(255,255,255,.32);
  border-radius:12px;
  display:grid; place-items:start center;
  padding-top:6px;
}
.mouse i{
  width:2px; height:7px; background:rgba(255,255,255,.6);
  border-radius:2px;
  animation:wheel 1.8s ease-in-out infinite;
}
@keyframes wheel{
  0%   { transform:translateY(0);    opacity:1; }
  70%  { transform:translateY(12px); opacity:0; }
  100% { transform:translateY(0);    opacity:0; }
}

/* ============================================
   通用区块
   ============================================ */
.section{ padding:130px 0; position:relative; }
.about{ background:var(--paper); }
.business{ background:var(--paper-2); }
.process{ background:var(--paper); }
.contact{ background:var(--paper-2); }

.sec-head{ margin-bottom:72px; }
.sec-num{
  display:block;
  font-size:12px; letter-spacing:.3em;
  color:var(--red);
  margin-bottom:16px;
}
.sec-title{
  font-family:var(--serif);
  font-size:clamp(30px,3.6vw,46px);
  font-weight:700;
  letter-spacing:.1em;
  line-height:1.3;
}
.sec-en{
  margin-top:12px;
  font-size:11px; letter-spacing:.34em;
  color:var(--gray-light);
}

/* ============================================
   关于我们
   ============================================ */
.about__intro{ max-width:900px; margin-bottom:86px; }
.about__lead{
  font-family:var(--serif);
  font-size:clamp(19px,2.2vw,27px);
  line-height:2;
  letter-spacing:.03em;
  margin-bottom:30px;
}
.hl{ color:var(--red); }
.about__text{
  font-size:16px; line-height:2.2;
  color:var(--gray);
  max-width:820px;
}

.core{
  display:grid; grid-template-columns:repeat(4,1fr);
  gap:1px; background:var(--line);
  border:1px solid var(--line);
  margin-bottom:96px;
}
.core__item{
  background:var(--paper);
  padding:44px 30px;
  transition:background .45s var(--ease);
}
.core__item:hover{ background:#fff; }
.core__char{
  font-family:var(--serif);
  font-size:44px; font-weight:700;
  color:var(--ink);
  line-height:1;
  margin-bottom:24px;
  transition:color .4s var(--ease), transform .5s var(--ease);
}
.core__item:hover .core__char{ color:var(--red); transform:translateY(-4px); }
.core__body h3{
  font-size:16px; font-weight:600; letter-spacing:.1em;
  margin-bottom:12px;
}
.core__body p{
  font-size:14px; line-height:1.95; color:var(--gray);
}

.stats{
  display:grid; grid-template-columns:repeat(4,1fr);
  gap:30px;
  border-top:1px solid var(--line);
  padding-top:56px;
}
.stat{ text-align:left; }
.stat__num{
  font-family:var(--serif);
  font-size:clamp(34px,4vw,54px);
  font-weight:700;
  line-height:1;
  color:var(--ink);
  margin-bottom:14px;
  font-variant-numeric:tabular-nums;
}
.stat__label{
  font-size:13px; letter-spacing:.18em;
  color:var(--gray-light);
}

/* ============================================
   业务板块
   ============================================ */
.biz{ display:grid; grid-template-columns:repeat(2,1fr); gap:34px; }
.biz__card{
  background:#fff;
  border:1px solid var(--line);
  overflow:hidden;
  display:flex; flex-direction:column;
  transition:transform .5s var(--ease), box-shadow .5s var(--ease), border-color .5s var(--ease);
}
.biz__card:hover{
  transform:translateY(-8px);
  box-shadow:0 26px 60px rgba(0,0,0,.09);
  border-color:transparent;
}
.biz__visual{
  height:210px; position:relative;
  display:grid; place-items:center;
  overflow:hidden;
}
.biz__visual::after{
  content:"";
  position:absolute; inset:0;
  background-image:
    linear-gradient(rgba(255,255,255,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.05) 1px, transparent 1px);
  background-size:38px 38px;
}
.biz__glyph{
  position:relative; z-index:2;
  font-family:var(--serif);
  font-size:82px; font-weight:700;
  color:rgba(255,255,255,.92);
  letter-spacing:.1em;
  transition:transform .6s var(--ease);
}
.biz__card:hover .biz__glyph{ transform:scale(1.09); }

.biz__visual--1{ background:linear-gradient(135deg,#1a1a1a,#3d3d3d); }
.biz__visual--2{ background:linear-gradient(135deg,#8d2b21,#b0392c); }
.biz__visual--3{ background:linear-gradient(135deg,#2b3a4a,#4a6478); }
.biz__visual--4{ background:linear-gradient(135deg,#4a3b2a,#7a6247); }

.biz__content{ padding:38px 36px 40px; position:relative; }
.biz__no{
  position:absolute; top:30px; right:36px;
  font-family:var(--serif);
  font-size:34px; font-weight:700;
  color:rgba(176,57,44,.28);
  line-height:1;
}
.biz__content h3{
  font-family:var(--serif);
  font-size:26px; font-weight:700;
  letter-spacing:.08em;
  margin-bottom:8px;
}
.biz__en{
  font-size:10px; letter-spacing:.28em;
  color:var(--red);
  margin-bottom:20px;
}
.biz__desc{
  font-size:14.5px; line-height:2.05;
  color:var(--gray);
  margin-bottom:26px;
}
.biz__tags{ display:flex; flex-wrap:wrap; gap:9px; }
.biz__tags li{
  font-size:12px; letter-spacing:.06em;
  color:var(--gray);
  border:1px solid var(--line);
  padding:5px 13px;
  border-radius:2px;
  transition:border-color .35s var(--ease), color .35s var(--ease);
}
.biz__card:hover .biz__tags li{ border-color:rgba(176,57,44,.32); color:var(--red); }

/* ============================================
   服务流程
   ============================================ */
.steps{
  display:grid; grid-template-columns:repeat(5,1fr);
  gap:0;
  border-top:1px solid var(--line);
}
.step{
  padding:44px 28px 0;
  position:relative;
}
.step::before{
  content:"";
  position:absolute; top:-1px; left:0;
  width:0; height:2px; background:var(--red);
  transition:width .6s var(--ease);
}
.step:hover::before{ width:100%; }
.step__no{
  font-family:var(--serif);
  font-size:13px; letter-spacing:.2em;
  color:var(--red);
  display:block; margin-bottom:18px;
}
.step h3{
  font-family:var(--serif);
  font-size:21px; font-weight:700;
  letter-spacing:.12em;
  margin-bottom:14px;
}
.step p{
  font-size:14px; line-height:2;
  color:var(--gray);
}

/* ============================================
   联系我们
   ============================================ */
.contact__grid{
  display:grid; grid-template-columns:1fr 1fr;
  gap:80px;
}
.contact__lead{
  font-family:var(--serif);
  font-size:20px; line-height:2.05;
  margin-bottom:44px;
  letter-spacing:.03em;
}
.cinfo{ border-top:1px solid var(--line); }
.cinfo li{
  display:flex; gap:24px;
  padding:22px 0;
  border-bottom:1px solid var(--line);
}
.cinfo__k{
  flex:0 0 84px;
  font-size:13px; letter-spacing:.14em;
  color:var(--gray-light);
  padding-top:2px;
}
.cinfo__v{
  font-size:15px; color:var(--ink);
  line-height:1.7;
}

.contact__form{ padding-top:4px; }
.field{ margin-bottom:22px; }
.field input,
.field textarea{
  width:100%;
  background:transparent;
  border:0; border-bottom:1px solid var(--line);
  padding:14px 2px;
  font-family:inherit;
  font-size:15px;
  color:var(--ink);
  outline:none;
  transition:border-color .35s var(--ease);
  resize:vertical;
}
.field input::placeholder,
.field textarea::placeholder{ color:var(--gray-light); }
.field input:focus,
.field textarea:focus{ border-bottom-color:var(--red); }

.btn-submit{
  margin-top:14px;
  background:var(--ink); color:#fff;
  padding:16px 54px;
  font-size:14px; letter-spacing:.16em;
  border-radius:2px;
  transition:background .4s var(--ease), transform .3s var(--ease);
}
.btn-submit:hover{ background:var(--red); transform:translateY(-2px); }

.form-note{
  margin-top:16px;
  font-size:13px; min-height:20px;
  color:var(--red);
}
.form-note.is-ok{ color:#2f7a4f; }

/* ============================================
   页脚
   ============================================ */
.footer{
  background:var(--ink);
  color:rgba(255,255,255,.62);
  padding:92px 0 40px;
}
.footer__top{
  display:grid; grid-template-columns:1fr 1.35fr;
  gap:70px;
  padding-bottom:64px;
  border-bottom:1px solid var(--line-dark);
}
.footer__logo{ display:flex; align-items:center; gap:12px; margin-bottom:22px; }
.footer .logo__mark{ background:var(--red); color:#fff; }
.footer .logo__text strong{ color:#fff; }
.footer .logo__text em{ color:rgba(255,255,255,.4); }
.footer__slogan{
  font-family:var(--serif);
  font-size:15px; letter-spacing:.14em;
  color:rgba(255,255,255,.5);
}

.footer__nav{ display:grid; grid-template-columns:repeat(3,1fr); gap:36px; }
.fcol{ display:flex; flex-direction:column; gap:13px; }
.fcol h4{
  font-size:13px; letter-spacing:.18em;
  color:#fff; margin-bottom:8px; font-weight:600;
}
.fcol a, .fcol span{
  font-size:13.5px; color:rgba(255,255,255,.5);
  transition:color .3s var(--ease);
}
.fcol a:hover{ color:var(--red); }

.footer__bottom{
  padding-top:34px;
  display:flex; justify-content:space-between; align-items:center;
  gap:16px; flex-wrap:wrap;
  font-size:12.5px;
  color:rgba(255,255,255,.36);
}
.footer__icp{ letter-spacing:.05em; }

/* ============================================
   响应式
   ============================================ */
@media (max-width:1080px){
  .nav__menu{ gap:26px; }
  .core{ grid-template-columns:repeat(2,1fr); }
  .steps{ grid-template-columns:repeat(3,1fr); }
  .step{ padding-bottom:26px; }
  .contact__grid{ gap:50px; }
}

@media (max-width:880px){
  .wrap{ padding:0 24px; }
  .nav__inner{ padding:0 24px; }

  .nav__toggle{ display:block; }
  .nav__cta{ display:none; }
  .nav__menu{
    position:fixed; top:var(--nav-h); left:0; right:0;
    background:var(--paper);
    flex-direction:column; align-items:flex-start;
    gap:0;
    padding:14px 24px 26px;
    box-shadow:0 18px 40px rgba(0,0,0,.1);
    transform:translateY(-14px);
    opacity:0; pointer-events:none;
    transition:opacity .35s var(--ease), transform .35s var(--ease);
  }
  .nav.is-open .nav__menu{ opacity:1; transform:none; pointer-events:auto; }
  .nav__menu .nav__link{
    width:100%; padding:15px 0;
    border-bottom:1px solid var(--line);
    color:var(--ink);
  }
  .nav__link.is-active{ color:var(--red); }
  .nav--over .nav__link,
  .nav--over .nav__link.is-active{ color:var(--ink); }
  .nav--over .nav__link.is-active{ color:var(--red); }
  .nav.is-solid .nav__menu{ background:rgba(250,249,246,.98); }

  .section{ padding:88px 0; }
  .hero{ padding-top:calc(var(--nav-h) + 24px); }
  .hero__content{ grid-template-columns:1fr; row-gap:34px; }
  .hero__aside{ padding-bottom:0; }
  .hero__eyebrow{ gap:12px; margin-bottom:20px; }
  .hero__eyebrow::before{ flex:0 0 26px; }
  .hero__title{ font-size:clamp(34px,9.5vw,52px); }
  .hero__desc{ margin-bottom:28px; }
  .hero__meta{ font-size:11px; gap:11px; }
  .hero__meta i{ width:14px; }

  .biz{ grid-template-columns:1fr; gap:24px; }
  .stats{ grid-template-columns:repeat(2,1fr); gap:34px 20px; }
  .steps{ grid-template-columns:repeat(2,1fr); }
  .contact__grid{ grid-template-columns:1fr; gap:52px; }
  .footer__top{ grid-template-columns:1fr; gap:46px; }
  .footer__nav{ grid-template-columns:1fr 1fr; }

  .about__lead{ font-size:19px; }
  .core__item{ padding:34px 24px; }
}

@media (max-width:520px){
  .footer__nav{ grid-template-columns:1fr; gap:28px; }
  .footer__bottom{ flex-direction:column; align-items:flex-start; }
  .cinfo li{ flex-direction:column; gap:6px; }
  .btn-submit{ width:100%; padding:16px 0; }
  .hero__desc{ font-size:14px; }
}